A practical treatise on the diseases of the ear including the anatomy of the organ . hand, when the fork was placed inthe tube. This method is certainly not without value, but the desid-eratum, namely, a method by which the ability to hear soundsresembling the human voice may be accurately estimated, isyet to be obtained. In testing the visual power we have exact means whichindicate the practical loss of sight which the patient may havesuffered. It is to be hoped that the physiology of acousticsmay at no distant day present us one for the accurate estima-tion of a loss of hearing power. * Arch
A practical treatise on the diseases of the ear including the anatomy of the organ . hand, when the fork was placed inthe tube. This method is certainly not without value, but the desid-eratum, namely, a method by which the ability to hear soundsresembling the human voice may be accurately estimated, isyet to be obtained. In testing the visual power we have exact means whichindicate the practical loss of sight which the patient may havesuffered. It is to be hoped that the physiology of acousticsmay at no distant day present us one for the accurate estima-tion of a loss of hearing power. * Archiv fur Ohrenheilkunde, Bd. I. 80 AURAL SPECULA. EXAMINATION OF AUDITORY CANAL AND MEMBRANA TYMPANI. The next step after noting the hearing power in the exam-ination of our imaginary patient, is the exploration of theauditory canal and the membranse tympani. It is, of course, implied in this that an affection of theauricle needs no special assistance for examination. For the purpose of examining the external auditory canalthree instruments may be necessary: a pair of angular for-. ^ Morceps. ceps, an aural speculum, and a concave mirror or first is of use to remove any temporary obstructions whichmay prevent a view ; the second dilates the canal; and thethird throws the light into it. According to Wilde* Dr. Newbourg, in a memoir pub-lished at Brussels in 1827, recommended an instrument whichis the origin of all the tubular ear specula now in use. It wasa slender horn tube, four inches long, with a bell-shaped outer
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Keywords: ., bookcentury1800, bookdeca, booksubjectear, booksubjecteardiseases
